Sequanium was the proposed name for a new element that Romanian physicist Horia Hulubei reported he had discovered in 1939.[1][2] The name derived from the Latin word Sequana for the river Seine running through Paris where Hulubei worked at that time.
Hulubei thought he had discovered element 93 in a tantalite sample from the French region Haute-Vienne. Element 93 was synthesised in 1940 and named neptunium.[3] It does in fact occur in nature in trace amounts, but it is not commonly believed that Hulubei actually discovered it.
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